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Statistical Atlas

Average Weather In January For Jackson Hole, Wyoming, USA

Location

This report describes the typical weather at the Jackson Hole Airport (Jackson Hole, Wyoming, United States) weather station over the course of an average January. It is based on the historical records from 2012 to 2015. Earlier records are either unavailable or unreliable.

Jackson Hole, Wyoming has a humid subarctic continental climate with cool summers and no dry season. The area within 25 mi of this station is covered by forests (85%), croplands (9%), grasslands (4%), and lakes and rivers (2%).

Temperature

The month of January is characterized by gradually rising daily high temperatures, with daily highs ranging from 21Â°F to 24Â°F over the course of the month, exceeding 31Â°F or dropping below 11Â°F only one day in ten.

Sun

Over the course of January, the length of the day is gradually increasing. From the start to the end of the month, the length of the day increases by 52 minutes, implying an average day-over-day increase of 1.7 minutes.

The shortest day of the month is January 2 with 9:00 hours of daylight; the longest day is January 31 with 9:52 hours of daylight.

Daily Hours of Daylight and Twilight in January

The number of hours during which the Sun is visible (black line), with various degrees of daylight, twilight, and night, indicated by the color bands. From bottom (most yellow) to top (most gray): full daylight, solar twilight (Sun is visible but less than 6Â° from the horizon), civil twilight (Sun is not visible but is less than 6Â° below the horizon), nautical twilight (Sun is between 6Â° and 12Â° below the horizon), astronomical twilight (Sun is between 12Â° and 18Â° below the horizon), and full night.

The earliest sunrise is at 7:41am on January 31; the latest sunset is at 5:33pm on January 31; the latest sunrise is at 7:57am on January 2; the earliest sunset is at 4:57pm on January 1.

Daylight saving time is observed in 2015 but it neither starts nor ends in January, so the entire month is in standard time.

Daily Sunrise & Sunset with Twilight and Daylight Saving Time in January

The solar day over the course of the year 2015 . From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (solar, civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The transitions to and from daylight saving time are indicated by the "DST" labels.

Clouds

The median cloud cover is 60% (partly cloudy) and does not vary substantially over the course of the month.

Median Cloud Cover in January

The median daily cloud cover (black line) with percentile bands (inner band from 40th to 60th percentile, outer band from 25th to 75th percentile).

On January 16, a representative day, the sky is clear or mostly clear37% of the time, partly cloudy7% of the time, and mostly cloudy or overcast55% of the time.

Cloud Cover Types in January

The fraction of time spent in each of the five sky cover categories. From top (most blue) to bottom (most gray), the categories are clear, mostly clear, partly cloudy, mostly cloudy, and overcast. Pink indicates missing data. Outside of the United States clear skies are often reported ambiguously, leading them to be lumped in with the missing data.

Precipitation

The probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around January 30, occurring in 53% of days. Precipitation is least likely around January 7, occurring in 46% of days.

Probability of Precipitation at Some Point in the Day in January

The fraction of days in which various types of precipitation are observed. If more than one type of precipitation is reported in a given day, the more severe precipitation is counted. For example, if light rain is observed in the same day as a thunderstorm, that day counts towards the thunderstorm totals. The order of severity is from the top down in this graph, with the most severe at the bottom.

Throughout January, the most common forms of precipitation are light snow and moderate snow.

Light snow is the most severe precipitation observed during 61% of those days with precipitation. It is most likely around January 29, when it is observed during 35% of all days.

Moderate snow is the most severe precipitation observed during 37% of those days with precipitation. It is most likely around January 1, when it is observed during 23% of all days.

Types of Precipitation Throughout January

Relative frequency of various types of precipitation over the course of a typical January.

Snow

The likelihood of snow falling is highest around January 30, occurring in 53% of days.

Probability of Snow Fall Being Reported in a Given Day in January

Probability that snow will be reported at least once in a given day.

Either snow rarely accumulates at this location in January or snow depth measurements are unavailable or unreliable.

Humidity

The relative humidity typically ranges from 63% (mildly humid) to 97% (very humid) over the course of a typical January, rarely dropping below 55% (mildly humid) and reaching as high as 100% (very humid).

The air is driest around January 22, at which time the relative humidity drops below 68% (mildly humid) three days out of four; it is most humid around January 1, rising above 96% (very humid) three days out of four.

Relative Humidity in January

The average daily high (blue) and low (brown) relative humidity with percentile bands (inner bands from 25th to 75th percentile, outer bands from 10th to 90th percentile).

Dew Point

Dew point is often a better measure of how comfortable a person will find the weather than relative humidity because it more directly relates to whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid.

Over the course of a typical January, the dew point typically varies from -2Â°F (dry) to 18Â°F (dry) and is rarely below -12Â°F (dry) or above 25Â°F (dry).

Wind Speed in January

The average daily minimum (red), maximum (green), and average (black) wind speed with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).

The wind is most often out of the north (24% of the time), south (21% of the time), and south west (14% of the time). The wind is least often out of the north west (3% of the time), east (3% of the time), south east (3% of the time), and north east (5% of the time).

Wind Directions in January

The fraction of time spent with the wind blowing from the various directions over the entire year. Values do not sum to 100% because the wind direction is undefined when the wind speed is zero.

Fraction of Time Spent with Various Wind Directions in January

The fraction of time spent with the wind blowing from the various directions on a daily basis. Stacked values do not always sum to 100% because the wind direction is undefined when the wind speed is zero.